package collection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
 * 对Point集合进行排序
 */
public class SortPoint {
    public static void main(String[] args) {
        List<Point> list = new ArrayList<>();
        list.add(new Point(5,8));
        list.add(new Point(33,290));
        list.add(new Point(21,52));
        list.add(new Point(45,6));
        list.add(new Point(55,69));
        list.add(new Point(1,2));
        System.out.println("list原始数据:"+list); //[(5,8), (33,290), (21,52), (45,6), (55,69), (1,2)]

        Collections.sort(list, new Comparator<Point>() {
            @Override
            public int compare(Point o1, Point o2) {
                //return o1.getX()-o2.getX(); //按对象的x属性升序
                return o2.getY()-o1.getY(); //按对象的y属性降序
            }
        });

        Collections.sort(list, (o1, o2)->o2.getY()-o1.getY());
        System.out.println("list排序后数据:"+list);
    }
}












